Pattern and Frequency Reconfigurable Annular Slot Antenna Using PIN Diodes

Nikolaou, Symeon; Bairavasubramanian, R.; Lugo, C.; Carrasquillo, I.; Thompson, Deborah; Ponchak, George E.; Papapolymerou, John; Tentzeris, Manos M.

doi:10.1109/tap.2005.863398

Cited by 325 publications

(138 citation statements)

References 23 publications

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“…Bandwidth can be improved through the introduction of lossy elements, but this has an impact on efficiency, alternatively one may look to tunable or reconfigurable antennas [3][4][5][6][7], as well as dual and multi-band antennas [8]. Tuneable antennas offer several real advantages in terms of potential frequency agility, bandwidth expansion, and polarization diversity [9]. Varactor tuning is a well established technique in passive microwave sub-system design, these diodes are small, have a large capacitance ratio, and may be tuned through DC voltage control [10].…”

Section: Introductionmentioning

confidence: 99%

A capacitively loaded antenna for use in mobile handsets

Elfergani

Abd‐Alhameed

See

et al. 2010

2010 Loughborough Antennas &Amp; Propagation Conference

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Abstract-A tuneable slotted patch antenna design is presented and verified for use in the DCS, PCS and UMTS bands. The tuning circuit consists of two varactor diodes, with some passive components, and is integrated fully with the radiator patch, with the varactors occupying different locations over the slot. The tuning does not require any further modification to the patch or feed geometry. Good agreement is observed between the predicted and observed impedance bandwidth, return loss, gain and radiation pattern, throughout the range 1.70 GHz -2.05 GHz.

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Section: Introductionmentioning

confidence: 99%

A capacitively loaded antenna for use in mobile handsets

Elfergani

Abd‐Alhameed

See

et al. 2010

2010 Loughborough Antennas &Amp; Propagation Conference

View full text Add to dashboard Cite

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“…The reverse biased diode (OFF state) is assumed to act as a very small capacitance, which thus represents high impedance which in turn can regarded almost as an open circuit for RF frequencies. Use of different kinds of simplified diode models has previously reported [16], [23], [24] and they are able to predict the return losses of the tunable antenna with a reasonable accuracy, as will be shown later in this paper.…”

Section: Introductionmentioning

confidence: 62%

A Frequency Tuning Method for a Planar Inverted-F Antenna

Komulainen

Berg

Jantunen

et al. 2008

IEEE Trans. Antennas Propagat.

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Abstract-A novel method is presented for electrically tuning the frequency of a planar inverted-F antenna (PIFA). A tuning circuit, comprising an RF switch and discrete passive components, has been completely integrated into the antenna element, which is thus free of dc wires. The proposed tuning method has been demonstrated with a dual-band PIFA capable of operating in four frequency bands. The antenna covers the GSM850, GSM900, GSM1800, PCS1900 and UMTS frequency ranges with over 40% total efficiency. The impact of the tuning circuit on the antenna's efficiency and radiation pattern have been experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex PIFA structures as well as other types of antennas to give enhanced electrical performance.

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“…Pattern reconfigurable antennas have also been proposed in literature. For example, [18] suggests an antenna that selects frequency and pattern by choosing one or multiple dipoles, [19] suggests an optoelectronic switch which could be used for frequency selectivity and pattern adaptability, [20] uses PIN diodes on annular slot antenna for null-steering.…”

Section: Introductionmentioning

confidence: 99%

Directional Antennas for Cognitive Radio: Analysis and Design Recommendations

Murtaza¹,

Sharma²,

Thomä³

et al. 2013

PIER

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Abstract-Cognitive radio technology proposes the utilisation of under-utilised spectrum resources which may include time, frequency, geographical location, direction, polarisation et cetera. Frequency is the conventional spectrum resource, considered to be exploited for cognitive radio, especially in the field of antenna design. We address the unconventional directional resource for cognitive radio, from antenna design perspective. The design concept of a multiband compact array, capable of providing separate and simultaneous access to frequency and directional resources, is presented. The initial explorations are carried out for three frequency resources (bands) and three directional resources, providing nine degrees-of-freedom altogether. Laboratory version of the proposed antenna system is then used to gain proof-of-principle through line-of-sight measurements in an over-the-air test-bed, followed by static outdoor measurements in a multipath scenario. At the end, simulations are performed for arbitrary arrays in heterogeneous propagation scenarios to study the influence of antenna radiation pattern on the availability of directional opportunity. Recommendations are made for possible antenna design based on the simulation results.

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Pattern and Frequency Reconfigurable Annular Slot Antenna Using PIN Diodes

Cited by 325 publications

References 23 publications

A capacitively loaded antenna for use in mobile handsets

A capacitively loaded antenna for use in mobile handsets

A Frequency Tuning Method for a Planar Inverted-F Antenna

Directional Antennas for Cognitive Radio: Analysis and Design Recommendations

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